python3Packages.waitress: disable tests on aarch64-darwin

I forgot to `git add` this part in 864b2a12b951 :facepalm:

Changed files
+1 -1
pkgs
development
python-modules
waitress
+1 -1
pkgs/development/python-modules/waitress/default.nix
···
pytest-cov-stub
];
-
doCheck = !(stdenv.isDarwin && stdenv.isx86_64);
+
doCheck = !stdenv.isDarwin;
disabledTests = [
# access to socket
"test_service_port"